如图所示,在△ABC中,DE是AC的垂直平分线,AE=3cm,△ABD的周长为1

题型:解答题

问题:

如图所示,在△ABC中,DE是AC的垂直平分线,AE=3cm,△ABD的周长为13cm,则△ABC的周长为______cm.

考点:垂直平分线的性质
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(2014·天水一中模拟)There is much chance________Bill will recover from his injury in time for the race.

A.that 

B.what

C.when 

D.which

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In 1901, H. G. Wells, an English writer, wrote a book describing a trip to the moon. When the explorers landed on the moon, they discovered that the moon was full of underground cities.

They showed their surprise to the “moon people” they met. In turn, the “moon people” showed their surprise. “Why,” they asked, “are you traveling to outer space when you don’t even use your inner space?”

H. G. Wells could only imagine travel to the moon. In 1969, human beings did land on the moon. People today know that there are no underground cities on the moon. However, the question that the “moon people” asked is still an interesting one. A growing number of scientists are seriously thinking about it.

Underground systems are already in place. Many cities have underground car parks. In some cities, such as Tokyo, Seoul and Montreal, there are large underground shopping areas. The “Channel”, a tunnel connecting England and France, is now completed.

But what about underground cities? Japan’s Taisei Corporation is designing a network of underground systems, called “Alice Cities”. The designers imagine using surface space for public parks and using underground space for flats, offices, shopping, and so on. A solar dome would cover the whole city.

Supporters(支持者) of underground development say that building down rather than building up is a good way to use the earth’s space. The space, they say, can be used for farms, parks, gardens and wilderness. H. G. Well’s “moon people” would agree. Would you?

小题1:The explorers in H. G. Well’s story were surprised to find that the “moon people” ______.

A.knew so much about the earth

B.understood their language

C.lived in so many underground cities

D.were ahead of them in space technology小题2:What does the underlined word  (paragraph 3) “it” refer to?

A.Discovering the moon’s inner space.

B.Using the earth’s inner space.

C.Meeting the “moon people” again.

D.Traveling to outer space.小题3:What kind of underground system are already here with us?

A.Offices, shopping areas, power stations.

B.Tunnels, car parks, shopping areas.

C.Gardens, car parks, power stations.

D.Tunnels, gardens, offices.小题4:What would be the best title for the text?

A.Alice Cities—cities of the future.

B.Space travel with H. G. Wells.

C.Enjoy living underground.

D.Building down, not up.

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多花野牡丹功效与作用

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对药品引起的新的和严重的不良反应需要报告的是()

A.上市后处在监测期的药品

B.列为国家重点监测的药品

C.上市5年后的药品

D.麻醉药品

E.精神药品

题型:解答题

现代思维的表现形式有()

A.逆向思维

B.侧向思维

C.动态思维

D.静态思维

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